w3schools css stylesheet code example

Example 1: external css

<html>
  <head>
    <link rel="stylesheet" type="text/css" href="mystyle.css"></link>
  </head>

  <body>

Example 2: css

/* Answer to "css" */

/*
  Cascading Style Sheets (CSS) is a style sheet language used for
  describing the presentation of a document written in a
  markup language like HTML.

  In other words, it's the style of the website.

  For example, the positioning of everything on a website or
  the colour, shape, size of a button. Every design on a
  website is most likely made using css.
*/